Never used Notepad++ but I would suggest vim diff. I guess its similar.
For many files, perhaps use the diff program instead, either on the lyx files themselves, or a text export of them, which if you could easily get from lyx with an AutoIT script (for windows).
Ben Ken wrote:
Hi all, Is there an easy way to compare the changes or differences between two LyX documents? The only method I can think of is to use Notepad++ to view the differences. If you have any other/better suggestions I would be grateful if you would please share them. Kind regards, Ken